They shouldn't. This must have been a mistake, probably an administrative error.
The reason for this is - Acknowledgement Receipt for OCI Original documents and Draft Payment submitted to BLS International Services
There are 7 options
1.Indian Passport
2.Landing Paper
3.Citizenship Cert
4.OCI booklet
5.Marriage Cert
6.Birth Certificate
7.Others
I heard that Surrender Passport fee receipt considered as a (Indian Passport proof) for OCI ( when you submit Surrender and OCI simultaneously)
I believe- BLS Toronto does not consider that.
Since Original Indian Passport goes to Surrender Passport required Original Document list
So for OCI they are taking one more original document either COPR or Citizen cert or etc..
Anyway I am OK with it -I am always B+
Thinking since they have to return back my Original Documents ASAP, by doing so they might open my application and process faster
HA HA just kidding