Hello I try to get an important letter but unfortunaltely the sender forgot to add the building no. to the parcel. Now it was send back to the post office I guess. Or is it beeing send back to the sender?

Frankfurt export customs cleared
Beijing Transit Station import customs scan
Beijing Transit Station import customs cleared (domestic transit )
Shanghai Transit Station import customs scan
Shanghai Transit Station import customs cleared (domestic transit )
arrive 临平路投递dept. delivery office
临平路投递dept. 正在投递
临平路投递dept. 已转
临平路post dept. received
临平路post dept. customs scan
leaving 临平路post dept. ，next station Shanghai 王港
Shanghai Transit Station export security scan
Shanghai Transit Station rejected ,remark (24)
Shanghai Transit Station export customs cleared

Is it still possible for me to get the parcel somehow? Or is it already on its way back?
Please help me.
Thank you

Thank you for your answer

Do you know, how long it approximately takes to go back to germany, as I guess it is send back by ship?
...and didn't arrive yet? (its nearly two month now)
Thank you again