Locate Rare Ongaku Koubou Audio

I’m trying to complete my personal archive of the early-2000s Japanese royalty-free library “Ongaku Koubou (音楽工房)” published by DDN / AIDIA. The discs are long out of print, so I need someone who can track down clean, full-length digital copies for private listening and preservation.

Target releases
• Vol. 2 – Super SE 5000
• Vol. 3 – Super Voice 5000 (include the 2004 renewal edition)
• Vol. 4 – The Sound of Three Directivity (catalog DDN-RCD-20010305)

What I’m looking for
• Lossless rips (WAV or FLAC preferred) taken from original media, or officially downloadable files if they still exist online.
• Correct track order, untouched audio, and accompanying cue sheets or metadata where available.
• Any scans of inserts, tray cards, or disc labels you can source to confirm authenticity.

Scope of help
My main need is simply finding the audio files themselves—whether that means locating download links, sourcing physical CDs and ripping them, or tapping collector circles. The search order isn’t critical; deliver whichever volume you secure first.

Acceptance criteria
1. Files verify against known track counts and durations for each volume.
2. Audio is free of skips, heavy compression, or watermarking.
3. All material is transferred via a cloud folder I can access and test.

If you have experience digging through Japanese auction sites, second-hand shops like Suruga-ya, or niche BGM archives, this should be straightforward. Drop me a short note outlining how you’d approach the hunt and any tools or communities you already use.