Would like to throw something out there that my friends and I found today. Give it try and let me know what you find out. We all signed up for Shift so we are watching for codes. Today they sent out a code that was worth 1 key and available for two hours. I went and got it and so did my friends. I then joined my friends game and he redeemed his key then I did. Went and played the slot machines for a few then walking back by I decided to just try the box again. The red key thing came up but the box opened anyways. My friend tried again(I was in his game) and it said he couldn't. So I stood there and I was able to open the box over and over with no keys. After doing it for an hour or so we got bored selling weapons, and we had so much stuff all over the room we just stopped. I left his game and went back to mine and I couldn't use the box. he joined mine he couldn't either. Later today he just released another key. I got it and joined A DIFFERENT friends game. We redeemed our keys and once again mine kept on going and going. My thoughts are maybe the key is glitching for only the two hours its available for redemption.... I'm not sure. I will be out and about tomorrow(Sunday) but there are more keys posted. If anyone wants to try please let me know what you find out! I don't know if having more than one key starting will hurt it. I had one key and one redemption key but the second time I only had one key. Goodluck and have fun unlocking the golden chest!