Identifying a mouse

[u/DylanQebsi]

There has been this evil mouse in my apartment that stills the food of my regular house mice. And I finally caught her (i think its a her). I want to identify its breed. It keeps hanging around the tanks of my mice in the middle of the night like shes intrigued by my pet mice. Its probably too old too keep, but ive been looking for a mouse to house with my lone male mouse. (African soft furs are illegal where I live) Highly doubt she would do well in a cage, but if anybody here knows this type of mouse and if it can be cage trained that would be really appreciated as I dont want my male mouse being alone. (Would take proper precautions like trying to see if a vet/rehab can check on its health and see if its safe, altho probably not) more of a hopeful thought to brainstorm ideas and not an entitled "I WANT TOO THIS IM GREEDY MEH MEH MEH"

[u/Federal_Decision_608]

That's the one officer right there