sideways,

I applied OPT in November and I got my EAD card in 2 weeks. I attached copies of all I-20s and previous EAD card with my application. DSO recommended me to attach copy of  all I-20's and previous EAD card. I did. I don't know about  this is new rule or not but It is safe to attached all the I-20s. Just shared my experience----- If you don't have, don't know-----