Well, because your Re-Entry Permit recently expired, I believe you have the following choices:
1) Apply for an SB-1 to come back to the U.S. showing that the reason that you took so long after your Re-Entry Permit expired was beyond your control. Here is a link:
2) You can use your green card to come back to the U.S. If they don't give you a problem coming back, you can apply for another Re-Entry Permit if you need 2 more years, but after that, they get harder and harder to get and they usually only give them for 1 year at a time.
3) You can use the green card to come back to the U.S., but if they give you problems, you may have to show that you are planning to stay in the U.S. from that point on or you may have to prove to an immigration judge in Removal Proceedings that you did not intent to abandon your green card status. You can do that by showing that you have been paying U.S. taxes, that you have been maintaining a U.S. home, that you have been paying U.S. bills, that your immediate family is in the U.S., etc. etc.
Technically, your status is still valid until an Immigration Judge decides that it is not, or until you file an I-407 acknowledging that you abandoned it.
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