You signed up for your mystery box subscription because you really liked the item they were offering. The problem is that since then you are getting items you have no interest in.
If you are sick of the stuff you get in your mystery box because you have no interest in it then check out Custom Fan Box. These are mystery boxes designed by you for you. Star Wars, Walking Dead, Star Trek, GoT, even Buffy the Vampire Slayer: they let you chose what you want.
Custom Fan Box is a monthly subscription service that has teamed up with top artists and brands to give you what you want. Each month you will receive 4 to 6 unique items in a theme that you actually want.
You start by selecting a T-Shirt design you want, then choose the fan box option and customize it by answering the questions. You get your chosen T-Shirt and then the other items will be chosen based off your selections.
Sounds better than getting stuff you have no interest in every month. Check them out.