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I found this parcel rack bag on the TPT between Grange Lane and Meadowhall around half eight, 29 April. I am at work in Chapeltown. No identifying features in the contents.
Tell me the sandwich filling and I will arrange collection.

Ill have it if its egg mayo
There should have been a pork pie in there as well ….
Slow smoked pigeon breast with red onion marmalade on Warburtons Toastie?
And a Pork Pie.
Shippams crab paste on Morrison's white bread cake.
Corned beef hash.
It can't be jam.
To have a jam sandwich, you'd need a 35 year old Carradice canvas bag probably on its third set of straps. and with various audax completion badges sewn onto it. So not jam.
I'm going to guess at one cheese and pickle, one ham and pickle.
Thank you for all the sandwich suggestions, I haven't posted for ages but the hive mind remains strong.
Looks like there's a resolution via Chapeltown Curtain Twitcher Faceb00k to someone in Wincobank, Sheffield. Reply below.
Oh, the sandwich was bread and dripping with jelly and BCBs, on ciabatta! Heady mixture for Wincobank.

Jebus, that sandwich is worse than any piss taking replies that may have been dreamt up!
Slow smoked pigeon breast with red onion marmalade on Warburtons Toastie?
Are you @binners evil twin?
I think the sandwich sounds delicious, good effort, I think he or she should be made an honorary member of STW!