2005 Outback Rear End 'Creaking'

[CaMfOs]

Hi all,
A few weeks ago I had my car parked in a car park and another car rolled into the back of mine -_-
After this, there has been extremely loud rattling coming from the rear so I took it home and noticed a few bolts had snapped off and I easily fixed that. Now that you cant here the rattling from the bumper, there is a very loud creaking noise coming from both sides in the rear (mostly from the left side). It mostly happens when the suspension compresses when cornering, odd angled driveways and terrain.
I've had another look underneath my car but i'm no mechanic. From what I can see, it all looks fine. Any ideas of what the problem is?

Thanks for all of the replies in advance

[1 Lucky Texan]

snapped bolts! yikes

well, perhaps inspect/disconnect the antisway bar (take 1 or both endlinks off) and see if the rattling changes. 'creaking' seems a little more like a bushing or bent strut issue though.

perhaps just take it to a collision service - those guys are often good at identifying damage from wrecking.