你们遇到这件事会怎么做？

搬走时候房东挑毛病找理由，莫名其妙扣押金怎么处理？

查一下你们州的tenant rights, 可以问一下housing legal aid. 一般来讲：
"Security deposits can only be withheld for damages beyond normal wear and tear, unpaid rent or unpaid utility bills. If you have not damaged the property, you should be entitled to a full return of your security deposit. The security deposit is your money!"