What set does this bag belong to? Black, grey, orange, and blue rubber band Code on bag is 5 number 127S
bricks are black, grey and a few orange
Contains small flat white box 6049725 which contains blue magic sand
Based on the colors in the bag, the potential date code of 12S7 (you wrote 127S but I assume that is a transposition error in your post), and the fact that there is a box with blue rubber bands in it (box number 6049725) I am going out on a limb and suggest this is set 75102 Poe Dameron’s X-wing Fighter from 2015. The seal code points to a 2017 production date which is possible, as this set was still being sold all the way up to early 2018. It has 5 bags (so having a bag marked 5 fits) and the 5th bag does contain both rubber bands as well as black, grey and orange pieces.