Not sure if my tenants have moved out after being evicted

[Stone Jin]

Thanks in advance.

We recently won a judgment to evict the tenant out.  It's been 5 days and I went to check on the unit and found that all their furniture is gone, however there are many boxes of "stuff" left in the house and garage.  I have 2 questions.

1) is this considered abandoned, can I assume they have moved?

2) can I change the locks without getting a writ of restitution?

I can probably store everything in the garage for the 21 days, but I'm unsure if I need to do that with abandoned items.