There is an issue where if you put Grips in and outside of the box, the price doesnt get deducted properly. I do have a fix for it and will have it in the next update :)
I'm working on a better method to make purchases but for the moment, you can just grab a grip and walk out, or place them all in the box and walk out. There are no penalities as long as you have the cash in your chest.
