As in Chinese, there are sentences in which the initial NP is understood as the object of the following verb, without any passive marking. Such sentences can be analyzed either as unmarked passive or as instances of topicalization of the object, with the subject being null. In one example, got may have been used as a passive marker.
Source: Tong 1862: IV.72
Source: Tong 1862: VI.22
Source: Tong 1862: IV.72