I gotta say, if he's got the cash to spend 20-30 K on cigars, he's got the cash to buy a really nice cooled humidor that will hold 2000 cigars. Those can be readily had for around $2K. of course, you could spend as much as you want, but not a whole lot less for that size. And its not going to take up half the garage. This would be maybe 3 x 6 x 6. A piece of furniture certainly meant for more than a garage.
I also gotta say this whole idea just doesnt add up, or else your buddy is stinky filthy rich and cares nothing about blowing 20k, cuz that's what he'd be doing by buying that many illegal habanos and then putting them in the garage. And all that assumes he could get away with buying them in the first place, and also assumes he'd be getting real CCs.
Something smells fishy