There were a few things Tony Stark did not do in his lab. Most of them were because of unfortunate accidents (let it never be said that he couldn't learn from his mistakes, given sufficient reason to). And some of them were because he was Tony fucking Stark.
He didn't lose projects, because he was Tony fucking Stark. He might forget to work on something for a while, and pile other projects on top of it, and sometimes knock things off tables and let them roll under benches and just leave them there, but he never actually lost anything. If he ever decided to work on that automatic coffee-maker that made a perfect cup every time, he could move the box of balls that shot spikey things and pull it out.
Tony fucking Stark didn't lose projects, especially when they were remotes to highly personal sex toy prototypes.
Maybe he just needed to look under those workbenches again.