The simplest answer to your question is that he needs the assistance of a local attorney experienced in handling criminal matters. The court and its staff will not respond to telephone calls from relatives or other interested parties in this sort of matter. Your posting seems to suggest some sort of connection between the circumstances of your boyfriend and your sister. That connection in terms of the handling of their respective matters does not compute in my book. In any event you need to help him secure qualified counsel. There are several such attorneys who practice in your area who participate here. Most will consult with you at no charge. Take advantage of that opportunity to speak privately with one or more suitable lawyers and save yourself the time and frustration of attempting to accomplish this on your own.
There are many facts that an attorney needs prior to making any suggestions. Was your boyfriend sentenced, was he granted house arrest as part of a bail condition, etc. There is nothing you can do. He needs to speak with his attorney to discover what needs to be completed prior to his release.
More facts are required for a complete answer, consult with an experienced criminal defense attorney to determine your best course of action.
The above answer is for information only; and does NOT constitute legal advice. This answer does not constitute, nor does it create, an attorney-client relationship between KaplunMarx, PLLC, Theodor Kaplun and any receiver. The information provided on these pages is general only, and you should not act upon this information without consulting with a qualified attorney.