1. All the experts have informed you that there is no correlation between your sister's maintenance claim and recovery of her streedhan. Exercising one right does not prejudice the remedy to enforce another right.
2. Your sister should at the earliest recover her streedhan. This opportunity may not be available at a later stage. A lengthy legal battle may have to be fought by your sister to recover it later if she does not do so at this juncture.
3. If she does not recover the streedhan now then police will retain it in its custody, which means that not only the process to get it released will be cumbersome, but also it is likely to get damaged in the police custody.
4. Cops coming to your house in uniform cannot be seen as wielding political clout by your sister's husband with the view to force you to withdraw 498A. While performing official duties policemen are required to be in uniform. By no stretch of the imagination this can be equated with harassment by police in connivance with your sister's husband. Nobody can force her to withdraw any case.
5. Do not ignore the notices you receive from PS.
6. At the first hearing of the maintenance case the court will ask your sister's husband to place an attested affidavit on record mentioning his earnings.