Hi,
If all you are doing is forwarding resumes to your boss, then a simple covering sentence will suffice such as:
"Please find attached latest freshers resumes"
If, on the other hand your role is more involved in the recruitment process, then your boss will expect more from you, such as comments for each CV, highlighting strengths and weaknesses, etc.
You should give your boss solutions for him/her to consider.
I hope this helps
Regards
Harsh