Interesting. While “a foreign county surrendering evidence” sounds quite mysterious, even common online platforms including FB, Twitter, or Google are owned by a company in “a foreign country” therefore warrants to obtain potential evidence must be submitted and granted through US courts.
My understanding is the process is very complex and lengthy and so I hope this is good news.
The Shermans also owned property in Florida. It’s quite possible the international search warrant doesn’t mean a breakthrough in the investigation.