My w2's were sent to my old address even though I gave my new address to the companies I worked for but my old roommate misplaced them how do I find out what the info was

Sorry you have to ask the employer for another copy.

getting a copy from your employer is one method another method is to get copies from the Social Security Adm.  there's a fee and no telling how long it will take

https://faq.ssa.gov/en-us/Topic/article/KA-02501

another method is to go online and get w-2 transcripts from the IRS - free but no state information 

https://www.irs.gov/individuals/get-transcript