Tubes Asylum

How can these be "matched" power tubes

86.10.108.253

I ordered two "matched quads" of output tubes from a reputable source selling through eBay. The package arrived and inside were 8 'unmarked' boxes containing 8 'unmarked' tubes.
Any other time I have paid a premium for 'matched' tubes, they carried markings to demonstrate this had been done.
Also if what I bought were two matched quads all packed together and unmarked, how can I tell which are members of each 'matched quad'? Maybe I have bought a magic matched octet instead! all eight tubes matched to each other? What do people think?

Follow Ups:

How can we know & help? - Allen Wright 06:16:11 11/03/09 (0)
RE: How can these be "matched" power tubes - Neff 06:02:43 11/03/09 (1)
- RE: How can these be "matched" power tubes - Michael Samra 13:00:24 11/03/09 (0)

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