So? You still have the hole and can peek inside to see if is empty or not. And if it's not then get it out and sledgehammer it in your garden, just for fun, then sell it to your local junk yard.
On the other hand, that you want to use it, then design your own robot and try all combinations. There is no time constraint since you're the owner, no need to "finish in 3 days"
On the other hand, that you want to use it, then design your own robot and try all combinations. There is no time constraint since you're the owner, no need to "finish in 3 days"