Can anyone possibly help me identify what my boxer is mixed with?

We got him from my cousin when he was about 2 months old. They were told he is a boxer terrier but that just doesn’t quite seem right? he has got a lot of little wire hair ( beard , ears, and by his eyes) and it’s growing even more as he gets older, he’s a little over a year now and we still can’t identify what he could be mixed with, we’re kinda tempted to get his dna tested because i feel he definitely has the boxer eyes but it’s hard to tell what he is mixed with. I’ve tried looking up any mixed boxer breeds but nothing really looks like him. He’s the sweetest little pup ever , licks a lot, and doesn’t bark much at all except for when he goes in protective mode. Anything helps, thanks!!