Honestly, many of my geckos are missing parts of toes. 
Though they’re presumably a lot older than your new baby, they’re examples of how it’s hard to completely avoid when you have a lot of geckos. Though it may be an issue with the breeder’s husbandry, every now and again it happens- you just miss the little bit of skin on the toes after a shed.
The breeder definitely should have told you and made sure you were ok with it, but in this instance I can understand that they may not have even noticed. Maybe they were blinded by the brilliance of that gorgeous tail! 
If they keep their animals on white or off-white substrate (e.g. paper towels, tub liners), the bit of skin on the toe would have been harder to spot, as stuck shed on the toes is usually white-ish.
Regardless, your new wee one should go on to thrive just fine. Don’t want you to worry about him. 
But if you’re concerned, you can add extra layers of substrate to provide a bit more cushion. His toes look healed, but I know a bit of cushion can sometimes make declawed cats more comfortable, so I imagine the same principle would apply to leos that have lost toe tips.