Hmm... everyone's probably going to have different ideas on the matter, but here's mine...
In a breakup, it's usually fair that each partner keeps the toy(s) that they used. So person A gets the toys that were used by person A and Person B gets the toys they used. You probably don't want to keep toys from another person because I doubt the next person you're with is going to be dying to use them (unless there's one really high end, sterilizable toy you want to keep and use for yourself, why waste you money?).
How many toys and how much? It's too late now since they were thrown out, but I think it's more important to look at why the toys were thrown out. Was it done in anger? Sadness? Guilt? Regret? I don't know the logistics of the relationship ending, but if you parted on more gentle terms, would you have given them back?
I guess in this case it isn't the what as much as "why."