It really depends on if they are picking up the puppy or shipping. I always have the papers, copy of the signed guarantee, food, shot records, ear taping guide sometimes, info on misc things like heartworm, microchips, toy, blanket and pee pads.
This is the last thing I made for the little biewer girl that was picked up
It's a pee pad cake! Her brother that went to CA (hand delivered!) I sent the cutest matching camo harness, toy and blanket - soooo cute! Of course he didn't get a pee pad cake as it would have fell apart, but he still got the pee pads and they were the ones they were used to while they were here
Sometimes they will get an outfit or harness or whatever I pick up for them. I have never gotten anything except a blanket when I have gotten a pup and I know how much I would adore it if I got extras!