Go to: http://www.ebood.co.il/index.php?lang=english
Step2
You will now see headers in English, but the content of each message will be in Hebrew or Gibberish. Assuming you don't know Hebrew, search for your lost items using place, kind of item and then check by the relevant date.
Step3
Since you can't read the Hebrew, you'll have to send an email to all the options that came up, but if you did as told before, this probably won't be more than 2-3 found objects. You can send your email in English - most Israeli's can read easy written English.
Step4
If you don't see your lost object, post a message on the site. You can write your message in English, bur be sure to use the right categories, so that those who can't read English can understand the basic facts. Good luck!