Dear scholar,
Please find attached these two works by unknown authors.
1. Avyayakoṣa
https://github.com/sanskrit-kosha/kosha/blob/master/avyayakosha_agyata/orig/avyayakosha.txt

2. Mātṛkākoṣa
https://github.com/sanskrit-kosha/kosha/blob/master/matrikakosha_agyata/orig/matrikakosha.txt

With regards,

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Dr. Dhaval Patel, I.A.S
Collector and District Magistrate, Surat