If the employer cited the supplies issue or any other issue as a “pretext” for discharging you for taking FMLA leave, then you may have redress to challenge your termination.
You probably want to consult with a knowledgeable local employment lawyer in order to determine whether it appears you have a viable claim under FMLA. He or she can assist you in ascertaining whether the explanation for your discharge seems valid or pretextual.

