just want to share my experience because i'm fairly in the early part of my addiction to hermes and, as pointed out, we all have different shopping habits as well as motivations for purchasing. i think it's both fair to be concerned about something (OP's question) and be skeptic about it (some responses). However we can do this KINDLY and without being rude to others.
I took home my first H (B30 - Blue Electrique) just a month ago. When I was offered the bag, i checked for what is common to the eye, defects/flaws, and decided whether the color and size fit my lifestyle. That's it. i didn't look for the stamp or what not. i'm not a reseller but honestly, i think it's a good idea anyway to know these things. In the grand scheme, it doesn't matter to me but since the info is out there -- it makes someone like me, paranoid especially when you're a bag newbie. i absolutely trust an H store and trust my SA but I am a walking paranoid person and think a bad bag (exchanged) can infiltrate a system and everyone can make mistakes. Not heard it happen but anything is possible.
i did ask my SA about the leather type when we were at the boutique and I remember Taurillon something something... and i asked care/whether the leather is easy to maintain and SA said oh yes this is a good leather, just don't ever get the bag wet. That's all i really needed to know. It felt light in my hands too which is what i mostly care about.
Fast forward a month later.. I can't remember the bag leather type. I still love my bag and would never dare return/exchange it, no matter what leather it is. The box and receipt do not state the leather type and i'm clueless as to how to find out what exactly it is, especially after reading and poking around that hermes offered a new type of taurilon leather this season. so i wanted to know which of those I had, as it may matter to me down the line.
I just wanted to point out that what is trivial information to someone, can be important to someone else. or sometimes we forget things.
OP - if you got it from a boutique, and the bag is in new condition, i would not worry about the date stamp! Love your bag for what it is.
Sideline - does anyone know how i can figure out the leather of my bag? Sorry to high jack your thread OP