Actually it might be just fine.
From previous experience (don't ask!) anything seized always gets bagged and dealt with properly.
In fact sometimes when you do get it back it has been charged up as well.
You can actually get special marked USB cables with VCC + Gnd and no data lines for this purpose.
The resistor trick is normally used to make the phone charge or for more modern ones they use a cheap OTP 6 pin micro
to emulate the special chip used via agreement with the manufacturers to guard against any claims of tampering.
Also newer versions add a monitor IC that gives the host control over power for gas gauging in case the device being recharged
goes bad and to guard against sneaky software (tm) that wipes or locks the device wth a time delay.