There was a figure on the pedestal you were holding. You asked what was it to the store owner.
"It is the thing it says. The Body Container. It swaps body whoever touches the body on it stored as a form of a figure. The reason why it was in the bargain bin... is that will make you younger. It was not intended, but it makes anyone who swapped regress the age. It is at least a month, but I think it can be 50 years maximum. If you got too younger to get negative age, you will be the fetus, might be an egg or something else by species, waiting to be reborn... and this is the major problem. However if you want to buy it, it is 3$."
It might be risky, but being someone else seemed worth to deal with the risk. Especially considering which body was contained in it. You paid for it and rushed to your home to test it. You touched the figure, which was the figure of...