博物院声称，虽然书札是其工作人员用博物院的钱购得，但从来没有在官方登记造册。
The museum claims that although the letters were bought by museum staff with museum money, they never formed part of the official collection.
第十六条受赠人接受捐赠后，应当向捐赠人出具合法、有效的收据，将受赠财产登记造册，妥善保管。
Article 16 When a donee receives a donation, he shall give the donor a lawful and valid receipt, keep a register of the donation and take good care of it.
受赠单位应当向捐赠人开具《接受社会捐赠专用收据》或者其他合法、有效的收据，登记造册入账，实行专项管理；
The recipient entity shall issue a Social Donation Receipt or another lawful and valid receipt to the donor for registration and bookkeeping, and implement special project management;
受赠单位应当向捐赠人开具《接受社会捐赠专用收据》或者其他合法、有效的收据，登记造册入账，实行专项管理；
The recipient entity shall issue a Social Donation Receipt or another lawful and valid receipt to the donor for registration and bookkeeping, and implement special project management;
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