CC Madhya 1.120
dui pustaka lañā āilā uttama jāniñā
In the olden days there were no presses, and all the important scriptures were handwritten and kept in large temples. Caitanya Mahāprabhu found the Brahma-saṁhitā and Kṛṣṇa-karṇāmṛta in handwritten texts, and knowing them to be very authoritative, He took them with Him to present to His devotees. Of course, He obtained the permission of the temple commander. Now both the Brahma-saṁhitā and Kṛṣṇa-karṇāmṛta are available in print with commentaries by Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura.