Value of Unused 1973 Tix

[Symmetry101@xxxxxxx]

I have two tickets my cousin (unfortunately) did not get a chance to 
use when 
Zep played Madison Square Garden the evening of Sunday, July 29, 
1973.  I 
believe this may have been when part of TSRTS was shot, but I'm not 
sure.

Does anyone have an idea on the value of these tix?  They're both in 
excellent condition (not mint as one has a tiny removal of its face, 
and both 
have thumbnail holes in the very top, middle, which does not 
interrupt any 
print on the tix).

Thanks for any feedback,

Chris