ripdotfun seems so obvious, surprised nobody has done this before? real physical collectibles, but the trading is digital - most collectible owners whose primary purpose is trading/investing don't care for storing physical inventory on their own anyway. 

main risk i guess is you're trusting the team for safe storage. i remember stockX was planning to do this with sneakers but didn't go through with it.

Yeah this is pretty much courtyard.io 

(They use brinks collectors vaults and you can claim your collectibles at any time or sell them digitally on marketplace)

I've been using them like a year now and absolutely love them.

Solid team really good selection of cards, and they just started doing comics