Oil leak IMS vs damaged seal HELP!

[Laredo]

I have a Boxster 2002. A couple of weeks ago I went to the Porsche dealer to replace the clutch and the rear main seal had a little oil leak so they also replaced the rear main seal. They didn't replace the 4 crankcase bolts at the rear of the engine neither the 3 intermediate shaft flange bolts. Then I noticed a small oil leak and went to Porsche thinking something was done wrong and is in warranty. Now they say the leak is from the IMS and they want to change and internal seal. They say its a new job and charge on more time. Note: Porsche will not install IMS solution

Questions:
If they didn't replace the bolt could this be the oil leak cause?
Could a faulty seal in the IMS be the cause?
Could this be and imminent IMS failure?
What Do you recommend?

The first and third pictures take it a few minutes ago, second picture a couple of weeks ago.