I had a 3 year old 38R fall over on a table one time with no turbine housing on it, and it bent one of the turbine blades...
I straightened it with needle nosed pliers and rocked out for another couple years until a big ass wad of eppiflex unwound from one of my up-pipes and went through the turbine, wedging into the housing and taking me a solid half hour to pry out even with the housing taken off the charger on the workbench.
Jonathan at Swamps clipped the bent sections of that turbine wheel off and AGAIN ran that turbo for ANOTHER year or so before it finally gave up the ghost...
So if the compressor wheel (very lightweight in the grand scheme) is "nicked up" a little, to the point of someone wondering whether or not it was due to housing contact, then I would guess that probably didn't imbalance the charger enough to take out the turbine seal.