[Landlord - MI] How to find tenant forwarding address

Very long story short, so instead of criticizing what was done wrong, we just need advice so we can serve them and collect.

Tenants were evicted some months ago. They owe over $10k in rent and damages. Turns out SSN was their mother’s, not theirs. They did not provide a forwarding address.

We hired 2 PIs to search, both being retired police officers. 1st couldn’t find much else than vehicles and past addresses. 2nd accidentally searched their mother’s info instead of theirs.

Here’s what we have:

• Full names (2 people) • Potential place of work (unknown schedule) • Vehicles + Plates + VIN number for 1 car • Mother’s address + SSN

All we need is their current address to serve, we have built everything we need against them and they also failed to appear in court for small claims. If you guys have any tips or suggestions or anything helpful, we’d greatly appreciate it :)