Vintage Bulk Handling & Storage Ideas

So if you had 11,000+ plus cards worth $3 to $40 each how would you store them. Let’s say it was a 40 card set and you had 200 to 800 of each card. They are raw in the boxes like they came from the printer (business card boxes). Do you put them in penny sleeves and Card Saver Ones? Put them in 400 count boxes, raw. The goal is to get some graded, sell on EBay and at shows.
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If you are actually looking to get rid of some of them I'd be a buyer and you can PM me and we can go from there!
Edit*
For the most part it is people looking for teams or to complete sets from a certain year, like last month I had a guy want every Kaline card from 1954 to 196~ and I ended up having 2 sold at full price.