Hey guys and gals I just recently bought a 07 Scion tC with 11k miles on it car obviously sat for long time.
Now when I am going over speed bumps very slowly getting a very light squeak noise coming from the front.

The dealer already replaced both front struts and both top mounts but, the noise is still present.

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Can only guess without seeing the car, but check the sway bar bushings. They should be relatively easy to replace. Make sure they are greased well.

 

Dealer says they greased all that stuff up well they can't find out what the noise is coming from only notice mostly when going very slow over bumps specially speed bunch more like a squishy sound I guess like something is flexing

 

your struts ( gas or liquid filled tube ) is encased with a large metal spring ( making it real simple )
could be a slow leak in the strut lift up the rubber boot and check for any dirt or greasy spots on the shaft if not then it could possibly be worn out springs when you compress them they make a weird squishing metal sound not like crinkling but like you sat down in a leather chair... if this is the case if you do replace them it is recommended to do at least both the front or both the rear struts at the same time to avoid premature tire wear and uneven ride height due to new spring and old saggy spring. Remember this may not be the problem it could be other components and that's the problem with suspension! Best of luck use youtube to help you understand how the different components work and itll help you discover the issue. Goodluck!