3 sentences

1. 失主很快就认领了丢失的钱包。

   shī​zhǔ hěn kuài jiù rèn​lǐng le diū​shī de qián​bāo.

   The owner quickly claimed the lost wallet.

   Source: Dong Chinese Dictionary

2. 捡到失物后，应当及时返还给失主。

   jiǎn​dào shī​wù hòu, yīng​dāng jí​shí fǎn​huán gěi shī​zhǔ.

   After finding a lost item, it should be returned to the owner promptly.

   Source: Dong Chinese Dictionary

3. 请失主尽快到失物招领处认领丢失的钱包。

   qǐng shī​zhǔ jǐn​kuài dào shī​wù​zhāo​lǐng​chù rèn​lǐng diū​shī de qián​bāo.

   Owners are requested to claim their lost wallets at the lost and found office as soon as possible.

   Source: Dong Chinese Dictionary