Paul-Son chips of that manufacture are subject to heat damage. The Lucite entombment process involves pouring molten Lucite over the chips, which will melt the surface of the chips and cause them to bond with the Lucite. (If you look closely, you will probably see where at least one side of the chips are a bit fuzzy in appearance from this bonding action.

What the result is, is that the chip cannot be separated from the Lucite without some sort of fine machining process, which will affect the surface texture of the chip and probably alert the cage that something is not right. Also, in some cases, the molten Lucite will cause a chip to warp, again, a tell-tale indicator of something being amiss.

As I understand the Lucite entombment process, there are two steps to make a completed object. Step one involves casting a portion of the object that will be used to support the items that will be suspended in the Lucite. Once that piece solidifies, the objects are placed onto it and then the second half of the Lucite is poured. I'll bet that if you look at the edge of the Lucite plaque, you will see a seam that coincides with a common surface of all the chips. While looking from that perspective, look to see if any of the chips have warpped.

Anyway, Jim K.'s short answer sums all this up into a single word, while my explanation is another story all together!

Jim