Ah, the unwanted gift. What is the real problem?

Have you offended anyone? If so, consider dealing directly by apologizing. A little self-deprecation goes a long way.

Does your family have some kind of use-my-gift-or-I-will-be-offended rule? In other words, are gifts given with strings attached and not as true gifts? If so, this is a troubling relationship and communication pattern that goes beyond the toolbox. I defer to professionals regarding any suggestions on how to deal with this.

Is it just being stuck with a toolbox you cannot use? Consider letting the thing sit for a while and see if you can discover a job for which it is well suited. Maybe outfit it to serve another family member?

Did they give you the receipt so you can do a return? If so, I see no problem - just return it for credit or something you really want / need.

The real gift, of course, was the respect and love shown to you and the toolbox was just a vehicle for that gift.