It the shaft still turns and no rattling sounds, the compressor hardware is probably fine. If true, I doubt it sent anything into your condenser. Sounds like one of the circumferential O-rings just extruded. Big suspicion is that the rebuilder's used the wrong size. As I recall, the R4's outer steel shell just slides over the aluminum guts, and the only thing securing it is some bent tabs. If it slides too far either way, an O-ring can blow out.

For $2K, you must have had shops involved. I put a Sanden on my 1985, w/ new hoses, and probably spent $300 total ($200 Rollguy's bracket, $50 new compressor, barrier hose from ebay). I kept the R4 on my 1984 and probably spent $50 on new hose, oil, and refrigerant.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans