Hai,
Please don't ask for Bank Statement, because an employer has no statutory right to ask one's bank statement and if at all you get his bank account No, you cannot get the details from the Bank because the bank is supposed to keep secrecy of the customers' account. A banker is bound by Bankers' Books Evidence Act also. So, it is just up to the employer to accept the details furnished by a candidate or reject it. You can ask clarifications like ' the percentage of HRA to Basic, what the other allowances mean, why the TDS is so' and so on. If you are not satisfied with the reply, put a note to the higher authority/ MD so that your side would be safe. It is up to them to decide whether to accept his previuos pay or not. And if you yourselves are the one to take decision, be positive and straight to say : " I feel that the pay shown in the slip seems to be inflated and, therefore, I can not accept it as it is".
Since it is an electronic statement, no need of signature and/or company seal.
Regards,
Madhu.T.K