aha! I looked into the problem and found that \ is an escape character in glob expressions so \\server\share is being interpreted as \server\share.

>perl -le"print for glob shift" \\tribble05\c$\*

>md \tribble05\c$\foo

>perl -le"print for glob shift" \\tribble05\c$\*
\tribble05\c$\foo

>>perl -le"print for glob shift" \\\\tribble05\c$\*
\\tribble05\c$\AUTOEXEC.BAT
...

>perl -le"print for glob shift" //tribble05/c$/*
//tribble05/c$/AUTOEXEC.BAT
...
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The \ doesn't need to be doubled in front of "*" because of hack used on Windows builds. From bsd_glob.c:

/* To avoid backslashitis on Win32,
 * we only treat \ as a quoting character
 * if it precedes one of the
 * metacharacters []-{}~\
 */
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