Oh, that very much sucks as I think I saw you bought part 1 in preperation. Was part 1 from Zavvi as well (probably wouldn't let you return it easily any way)
Although I can't talk as my Dr stone set consists of Part 1 and part 2 LE, and i'm probably never gonna open part 1 as my intent is to replace the Blu-ray cases with the steelbook (especially as its only Ā£10.50 (with code and red carpet) but I already had, just current price is super tempting for Ultimate limited edition (+ you get to make up the name of the edition))
Hopefully you'll manage to pick up dr stone LE elsewhere, I think its been going for pretty low prices as of late (I assume they are just struggling to sell, or it because who ever has all the stock has stored it really poorly and is not in great condition), it was just finding one thats in the condition you want, I bought one a while back super cheap and new but was pretty dented (although that was just thrown in a jiffy bag) as well as splitting along the edge of the paper art work.