how do I file USPS claim I shipped usps first class mail insured VIA payapl?

[mallsupplycom]

i shipped a package first class mail using usps via paypal and i did insure it but package got damage in mail and customer wants to get exchange.  but I didinsure the package but I have no clue how to file claim with usps because i used usps services via paypal, and pitney bowes?

Con someone help me out please.  this is first time it has happened to me that my package got damage in shipping 😞

[surplusdealdude]

Ask the post office - they'll know the specific forms you need.