[Five]

Not only SHNs need to be checked, all formats need to be checked including FLAC and APE.

You can easily check by using foobar2000 (follow the link in my sig for converting shows and scroll down to ssamadhi97's post), Trader's Little Helper, Batchenc or plain old shntool linked above.

for shntool:
shntool len *.flac > len.txt

for batchenc:
shntool len <allfiles> > len.txt

if there are tracks with sector boundary errors -b- will show up the the cdr column. tracks that are fine will display ---