CD/Vinyle Estate sale question


Hello, this is kinda a weird question 

i own a funeral home home and a family I am working with (friend of my family) lost a family member who was into music.  He had a really nice home theatre setup, stack of amps and misc 2ch and HT gear all of which looked to be  extremely well cared for.  

The family doesn’t know what to do wit8h some of the audio equipment and mostly CD’s and vinyl records.  Estimated somewhere between 5,000 and 10,000 records and CD’s, the family thinks possibly closer to 10,000  all of which are classical music.

any suggestions on a way to determine value or a place to sell them or get a value?  
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I would say don't sell them to a shop with overhead there in business to make as much money as they can I've done really well with discogs and ebay best of luck 
https://palmspringsestatesales.com/
http://sandiegocountyestatesales.com/
Early in fleabays years, I would make killings on cool stuff. 
 My fav was a 310 LP lot of rare British/American METAL. 

    A lot of rare great NWOBHM lps’, 7”, etc. 

 the price ended up at about 180-200$   Was so happy when I won.

   Most of the rare stuff I put on cd,