What goes wrong

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Joining the fit table on the wrong catalog number That mistake was made here and is recorded rather than hidden Reading a recorded fit as a tested fit Treating the fit table as independent evidence Reading twelve empty neck finishes as missing data Quoting the median number of fitting closures Mixing hook sizes in one jar Storing soft bait with other soft bait of a different color And expecting this property to tell you about lead tackle References

Including an empty join read as missing data. Which is the one to remember.

Joining the fit table on the wrong catalog number

It is keyed on the supplier’s stock number. Joining on ours returns nothing on either side, which looks exactly like a table that does not cover the shelf. It covers 228 of 251 containers.

That mistake was made here and is recorded rather than hidden

Two SKU namespaces in one database, and an empty join that reads as an absence. The check is whether the join fails on every row or on some, because a total failure is usually a key problem.

Reading a recorded fit as a tested fit

The fourteen rows in the whole table that state a basis say the supplier used the same neck notation on both parts. That is a reasonable ground and it is not a trial.

Treating the fit table as independent evidence

For the 216 containers where both can be computed, the table’s count equals the same-notation count exactly, on every one. It is derived from the notation rather than checked against it.

Reading twelve empty neck finishes as missing data

Those twelve are polypropylene round tubs, which take a seated lid rather than a thread. The field is empty because it does not apply, which is a different state from unrecorded.

Quoting the median number of fitting closures

It is 61 across one population and 36 across another twelve rows larger, because 56 containers sit at 67 and 56 more at 61. Six values cover 194 of 228 containers, and quoting those six is shorter and true.

Mixing hook sizes in one jar

The size scale runs one way in numbers and the other way in aughts, nothing is printed on the hook, and sorting is done by eye against a known reference. It is the leaf where one size per container matters most.

Storing soft bait with other soft bait of a different color

Plasticized baits release plasticizer, which can mark some plastics and migrate between baits. Fifty six of the 251 containers are glass, and separate containers per color is the rest of the answer.

And expecting this property to tell you about lead tackle

Whether lead shot or lead sinkers may be sold or used varies by state and by water, and none of that is in this record. The Lacey Act is the spine here because it borrows every standard it applies, not because it says anything about tackle.

References

The Davis Pack Supply catalog, measured 19 October 2026. The closure fit table holds 55,902 rows naming 1,119 container references and 764 closure references. It is keyed on the supplier’s own stock number rather than on our catalog number: joining on our number matches nothing on either side, and joining on the supplier reference resolves every row, with no unmatched container reference and no unmatched closure reference. 55,888 of the 55,902 rows record no basis for the assertion. Fourteen record one: twelve read "supplier states the same neck notation on both: 43MM" and two read "supplier states the same neck notation on both: 40MM". Catalog-wide the table associates between 1 and 109 closures with a container, averaging 50.

The Davis Pack Supply catalog, measured 19 October 2026. The number of on-shelf fitting closures per container is distributed in spikes rather than smoothly: 56 containers have 67, another 56 have 61, 36 have 36, 16 have 27, 12 have 17 and 18 have exactly 1. Because two spikes of 56 sit either side of the midpoint, the median moves a whole step between the 216 containers that share a neck notation and the 228 that have any recorded fit, from 61 to 36, purely because twelve low-count rows were added to the population.

The eighteen leaves in this group as the catalog indexes them: fishing tackle, bobber stop, crimp sleeve, fly hook, fly tying bead, hook bait, hook circle, hook treble, jig head, leader ring, lead shot, sinker egg, sinker pyramid, snap swivel, soft bait, spinner blade, split ring and swivel barrel. 16 U.S.C. 3372 prohibits trade in fish, wildlife and plants taken in violation of other law and does not reach any of them.

Written from 16 U.S.C. 3372 and from the catalog as it stood on 19 October 2026. That section is the Lacey Act prohibition and it makes a federal offense out of trade in fish, wildlife or plants taken in violation of other law; it does not govern hooks, swivels, sinkers or beads, and nothing here says it does. Nothing here states whether lead tackle is lawful in any jurisdiction, which varies and is not in this record, and nothing here is guidance about fishing or licensing. A closure recorded as fitting a container shares a neck notation in the supplier record, which is not a test of fit. This shelf is shared identically by nine groups and the sewing notions property enumerates the inventory.