today i was very excited when i got home from work to find one of my hand written envelopes, inside i found a reply off diana vickers (uk xfactor star) but wat was inside the envelope wasnt mine

i knew she repiled via her record company so about a month ago i sent her a glossy photo, my album cover, a letter and a sae.
in my sae was 2 pictures i hadnt sent (a4 size paper pictures)
they must have been mixed up somehow and they were inscribed to laura
1. im worred because i have someone elses things (i know she doesnt send those)
2. ive lost my album cover (im not too bothered about the picture)
what should i do? i know these things happen but should i write back or not? i only sent my cover as i knew she replied so i wouldnt loose it...
any imput would be apriciated