The Aéroports de Paris website has a lost property section that lets you track down the correct people to contact dependent upon where your think your item was lost.
So if you lost something whilst transferring from the plane to the baggage area then you'd contact your airline, if it was in an airport toilet or the check-in area then you can complete an online form that goes through to staff at Aéroports de Paris.
After a period of time items are sent on to the Paris police office and their lost property service, who again offer tips on possibly finding your things through their site.
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