2009 Lincoln Formative Years Rolls/Errors

Okay, first thing's first. You are using the term 'error' and 'variety' interchangeably, and they aren't. You are likely talking about the numerous doubled die reverse dies known for the year, and those would be known as 'die varieties' - not 'errors'. The difference is enough that collectors for the two often don't mix. It's like Ford and Chevy.

So..what to do? Well, there are nearly 100 completely different doubled dies known for 2009 cents, only 9 of which are on D mint LP2 cents. All of those are minor.

Whether you should open them? Well, they aren't worth a heck of a lot anyway...rolls sell for around $1 each - about double face value. Sticking them in a closet probably won't do you any good either. Too many people saved these for them to have much value within the next 30 years or so. Well, enough that they would be worth substantially more saving them.

Your chances of finding a doubled die in them? Pretty slim. Should you break them open? Why not...they aren't really worth much.

Where can you find photos of what to be looking for? Right here:

http://www.coppercoins.com/advsearch.php

Just enter '2009' in the first 'year' box and click submit.

Were these found on the Denver cents or only on Philly cents?

The mint wrapped rolls were only P. I believe all business strike were also only P.