I dont think you can get caucht by stealing bitcoins do you know why because bitcoins are not from you they are from everyone who has bitcoins because they are not on your name.
If you use the stolen bitcoin and people can link the spending with you, then you will be caught. It is better to mix it.
Its much more better if you will back than stolen bitcoin from the people who you stole because spending that bitcoin without any permission of the owner is a sin and if they caught you maybe the trust that you both build will be destroy it is much better if you don't do it for the sake of friendship
