Questions & Answers about Крепёж и упаковочный скотч лежат в коробке.
Because the subject is made of two nouns joined by и:
- крепёж
- упаковочный скотч
Together they mean X and Y, so Russian normally uses a plural verb:
- Крепёж лежит в коробке.
- Скотч лежит в коробке.
- Крепёж и скотч лежат в коробке.
So лежат agrees with the whole combined subject, not with each noun separately.
Russian often uses verbs that describe the physical position of things.
- лежать / лежат = to be lying
- стоять / стоят = to be standing
- висеть / висят = to be hanging
For loose objects such as fasteners and tape in a box, лежать sounds natural. Russian prefers this kind of positional verb where English often just says is/are.
A more neutral alternative would be:
- Крепёж и упаковочный скотч находятся в коробке.
But that sounds more formal and less natural in everyday speech.