Bloody stoner mouse! lol. I know a good way to get rid of them, Put anything really smelly, like Mint or Lavender near to where you think they are getting in, or like me, put it everywhere!

They have really weakl respiratory systems so will choke on the smell!
I literally cleared my house from all mice just using fresh mint from the garden, lavander and orange peel.
Found them dead one by one throughout the week.
Try it! it works a treat.
Good luck to ya on your grows, am pulling up a chair for this one if thats ok.