cenvat credit

regarding cenvat credit, it was old practice to "submit the excise invoice duplicate copies" to range superintendent, for chcking of input credit with RG23A-Part2 register, who "deface" the invoice with note " input credit availed -verified" with their seal and signature, 

in current rules no such bindings for such defacing, but if asked for, the assessee has to produce the documents for their verification, but there is nothing wrong if old practice is kept in force by assessee, in fact - this is extra safeguard of assessee, and at later stage such input credit on such invoices can not be questioned by department. 

Usually such checkings are done by department at departmental audit.