My musette salsa, damier mini tribeca and mini lin 4 key holder bought from Paris in 2003 also did not have date code compared to the monogram canvas samur i bought at the same time. Just cannot find them. Even so the monogram key & change holder and billfold with 6 credit card slots wallets which i bought in singapore in 2006 have no date codes. Cannot find them, i also saw from the mini lin 4 key holder' slip/card that has the date code. I suppose too small items do not have date codes but i feel safe as i bought from LV directly with their receipts with me. If i buy online from other sellers with no receipts then i think i will freak out. So hard to tell the fakes sometimes.
Musette Salsa date code is heat stamped on the alcantra lining inside the pocket along the seam:
Damier Mini Tribeca:
Mini Lin 4-Key Holder date code should be in the same place as all other key holders: