help respond to this facebook message?

[AllinDan]

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Subject: sooooo random
Message: hi, i know this is really really random but i was just cleaning out a bag i used at school last semester and i found a piece of paper in it with your phone number on it..... or maybe another dan xxxxxxxx's number? i'm not sure. i think it's a (858) area code which isn't davis or berkeley but i thought i'd ask anyways. the last 4 digits are 9099. sound familiar? if you don't know what i'm talkin about then never mind... i'm really sorry!! BUT if you think you might know how this number got into my bag i'd love to hear about it. so, let me know k?
take care [img]/images/graemlins/smile.gif[/img]

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she looks semi cute, but it's hard to tell from just the profile pic. It's definitely not my phone number.

ideas?