My experience - I've had to bust up the OEM casing to put electronics in a new case. If it hasn't been dropped on pavement from 5 foot or more I would have doubts about the chip shifting (not saying it couldn't happen).. if you shake it do you hear anything rattling around inside?

Note: my doubts of chip shifting - have you seen the glue job on those? And on my 04 it had a plastic "cage" to hold it in place.