Set of 4 Hitachi 6AU6 vacuum tubes (junk)

This is a set of 4 used 6AU6 vacuum tubes, often used as drivers for preamplifiers and power amplifiers.
These were salvaged from used audio equipment, measuring instruments, and communication devices acquired over 20 years ago, and have been stored as parts. They are being listed as part of a life- 정리 (end-of-life preparations).
When tested by inserting all four into the driver stage of a DIY power amplifier, the heaters lit up and sound was produced. However, as they were acquired as junk items, there is a possibility of characteristic degradation.
I recall that the Hitachi-made tube was removed from surplus VHF radio equipment for government use.
As they are not in individual boxes, they will be wrapped in cushioning material and shipped anonymously via Yu-Packet.
These are old items and are being sold as junk. Therefore, please purchase with the understanding that returns will not be accepted even if there are issues such as dirt or excessive noise upon arrival.
Thank you for looking.