Several 100 people retired nationwide on June 30th & July 31st, after being told there was not enough money in the budget for severence pay. Aug.25th it was announced that they were going to give $15000.00 to anyone wishing to retire.
The answer to your question is "it depends". If there was a qualified severance plan in place that the Post Office did not comply with or if they paid severance in a discriminatory fashion, there may be a claim. I suggest you contact an attorney to discuss the details and get more information on your rights.