(a) Written notice of injury as used in Texas Civil Statutes, Article 8306, §18a, shall consist of either:(1) an employer's first report of injury (IAB Form E-1); or(2) any other instrument in writing, regardless of its source, which fairly informs the carrier of the name of the injured worker, the identity of the employer, the approximate date of injury, and facts showing compensable lost time or the probability of compensable lost time.(b) Every carrier shall promptly and legibly date stamp every written notice of injury received by it, showing the date such notice was received.