What type of mouse is this? And where can I release him/her?

I caught this little cutie but it's -2 to 7 degrees celcius outdoors and sometimes raining. Any ideas where/how to release him so he has a chance at survival? Also can anyone recognize what type of mouse he is? His name is Foster btw. :P

ps: He seems to have a tail injury. Does it look serious?
Update: pss: you can compare his size with the popcorn
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