There is no such thing as you have mentioned in Section 151 Cr.P.C. Perhaps, you are referring to Section 251 thereof.
You should check the records. It may be in the specified format itself as to whether the accused pleads guilty and whether he wants to be tried and the reply of the accused might have been recorded therein, though the Magistrate might not have asked orally.
The order under Section 256(1) of the Cr.P.C. is passed due to absence of the accused. You may have to file a revision against such order explaining why you as complainant (and/or you advocate) could not appear in the court on the designated day. That whether accused pleads guilty was asked or not, may be an irrelevant factor for this purpose.
If the warrant is not being served at the address given, then naturally the Magistrate would ask for the correct / new address of the accused person. It is for your own benefit as the complainant. If you feel that the address given already is correct and that the office is closed for last few months, you may state the same in the court. But, at the same time, when the office is closed, you should provide some alternative address (such as residential address), otherwise how will the warrant or summons be served if the office continues to remain closed for few more months, and in the absence of that, how will the trial start or complete?
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