You could also say "stashed." A stash is something that is hidden or secretly stored away. In slang, it usually refers to drugs. It is also used to describe hidden money. Examples: She didn't want her parents to find her stash, so she hid it under her mattress. Rich people often stash their money in Swiss banks so that they don't have to pay taxes on it.

"Stashed" would be the common word choice here. And if the criminals were staying there in the warehouse as well, you could say that the criminals "holed up" or "were holed up" in the warehouse. At least that's what comes to mind when I think about the movie Reservoir Dogs, although I may not win a prize for original writing.

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I think there are various possibilities. You could indeed use store in the past tense-stored. You could also use hid, the past tense of hide if you add the article 'the'. The suspects hid the drugs in a rented house.