Como remover 'SAMPLE NÃO MAIL' da imagem da API de remessa do USPS

Estou tendo problemas com a API de remessa do USPS

Aqui está o meu XML

https://secure.shippingapis.com/ShippingAPI.dll?API=DelivConfirmCertifyV4&XML=%3C?xml%20version=%221.0%22%20encoding=%22UTF-8%22%20?%3E%3CDelivConfirmCertifyV4.0Request%20USERID= % 22228OURBA2607% 22% 20PASSWORD =% 22728ZK94KL112% 22% 3E% 3CRevisão% 3E2% 3C / Revisão% 3E% 3CImageParameters% 20 /% 3E% 3CFromName% 3EJohn% 3C / FromName% 3E% 3E% 3CFromFirm % 3E% 3CFromAddress1% 3EFlat% 201% 3C / FromAddress1% 3E% 3CFromAddress2% 3ERoad% 201% 3C / FromAddress2% 3E% 3CFromCity% 3ENY% 3C / FromCity% 3E% 3CFromState% 3ENY% 3C5C / FromState %12E % 20% 3C / FromZip5% 3E% 3CFromZip4 /% 3E% 3CToName% 3E% 20Mozilla% 20Foundation% 20% 3C / ToName% 3E% 3CToFirm% 3E% 20% 3C / ToFirm% 3E% 3CToAddress1% 3E% 20Building% 20K 20% 3C / ToAddress1% 3E% 3CToAddress2% 3E% 201981% 20Landsings% 20Drive% 20% 3C / ToAddress2% 3E% 3CToCity% 3E% 20Mountain% 20View% 3C / ToCity% 3E% 3CToState% 3E% 20CA% 20% 3C / ToState% 3E% 3CToZip5% 3E% 20% 20% 2094043% 20% 3C / ToZip5% 3E% 3CToZip4% 20 /% 3E% 3CWeightInOunces% 3E% 203% 20% 3C / WeightInOunces% 3E% 3CServiceType% 3EPriority% 3E % 3E% 3CImageType% 3ETIF% 3C / Imag eType% 3E% 3C / DelivConfirmCertifyV4.0Request% 3E

Ele retorna a imagem correta, mas em cima está escrita AMOSTRA NÃO CORREIOS. Como remover isso?

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