Please form an orderly queue.

Lorna writes:

On a footpath in Fitzwilliam Square [Dublin 2] just now – an envelope with a sum of money enclosed. Would hate to see someone stressing about having lost it. Not saying the exact amount for verification purposes but significant enough.

No sign of identification or way of finding the owner in the envelope except a bit of pen scribbling on the outside. Perhaps the readers might know someone who lost it?

Amount of money and colour of envelope could be the right answers to prove legit claim?

Anyone?