Sale 1:

https://backpack.tf/profiles/76561198212047005#!/compare/1611100800/1611273600 - 9746667722

https://backpack.tf/profiles/76561198020224041#!/compare/1611187200/1611532800

Blaze.xTH3RM4Lx: https://backpack.tf/suggestion/602f520e689af74fe66c9dc2#comment-603fd3e71192673f3c65ebcd

all the 100 keys were obtained together which likely suggests the sale was 100 keys rather than just the 50. the reason that the near ID doesn't match everything could easily be due to the fact that the keys were obtained really quickly and didn't register in the buyer's bp which is why you don't see any keys leaving their side of the compare

= 100 Keys.