To attract people's attention, you can:
write a big heading, e.g. LOST! FOR SALE!
include an accurate photo of the item you lost/want to sell.
Make your notice clear and easy to read:
use bullet points.
don't include unnecessary information.
Include all the necessary information:
write a simple description of the object (colour, name, etc.).
say where and when you lost the object (LOST!).
give your name and contact details.
offer a reward (LOST!) or give the price (FOR SALE!).
