I don't know how long it's been out for, but I just saw on ebay tonight a number of "cheap" BAPE MP Convoys, and some were saying that they were Knock Offs.
Some had the packaging pictured, and both box and toy look like the BAPE toy (I don't have one, so there could be something obvious to spot the fake).

Prices were $120-150, which is still very expensive for the MP-10 mould, but it was suspiciously cheap for the BAPE MP-10 toy, which is demanding $800-1000.