Buying new advice - Serial Numbers, should I care?

[JB7]

Going to buy Sub this week and wondered if I should be at all bothered about the s/n?

Only reason I ask is because the Rolex forums are the ONLY watch brand that ever talks about it, L or V or X or Y or random? Is random worse than an 'X' or a 'Y'? Does it make ANY difference to me, the resale or anything at all to anyone?

On other forums they give you a date and age of the watch but on here we seem to get a serial number. Is that purely for the age of watch. I'm more interested in when someone bought it, as opposed to if it was made the year before, I want to know how long it's been out the shop firstly, then I'll worry about when it was made.

But to cut a long boring story short.... sorry, should I care?

Also, what should be in the box with a new Sub these days, so I can see what's what. Local dealers aren't forthcoming with cards and cloths in my non Rolex experiences. For Londoners do you buy in the big expensive stores in London as opposed to locally out in suburbs when there's no price difference whatsoever. You're kind of frowned upon asking for discounts on Rolex by all and everyone.

Thanks for help all.