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 am one of the few idiots that buy large intact classical collections, but I am near Dallas and probably can not squeeze in the 10000 discs you have in with the 100000 I have. Dealers will come to you to cherry pick the most valuable items and then you will need to decide on how to sell the remaining 9000 discs(Craigslist,estate sale,...). Then you will probably still have 8000 and if lucky some dealer or store might offer about a dime a record. If the current owner of the collection is fortunate enough to itemize deductions on their taxes it may make better financial sense to donate the collection and take the fair market value (up to whatever cap the tax code stipulates).
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,