The earlier Boot Hill 2nd edition box set mirrored the contemporary Holmes edition Dungeons & Dragons box set in its structure. They used a glued-sheet-on-paperboard box.
At some point, TSR switched to a box where the graphics were printed directly on the paperboard, used with TSR’s early-80s sets and beyond.
Some comparison photos follow. Note that TSR, in the transition period, did some mixing/matching of parts, based on available supplies I’d reckon. I’ve seen the early TSR dice in a later format box set, for example. And I’ve seen later print books in early boxes.
Early and later Boot Hill boxes
The early Boot Hill box also came with a pair of TSR’s early “Low Impact” dice. They were notoriously quick to wear, but are rare and popular with collectors now.
The early set had noticeably thicker counters.